Keeps your various running the way it should — this MANN FILTER part restores the original function of a worn or failed Coolant Expansion Tank MANN & HUMMEL MANN FILTER OE Ref 184 3659, built to OEM reference 1649751 rather than a generic approximation.
MANN FILTER identifies it as WA9002, EAN: 4011558094041. Match that against OEM 1649751 or your old part before fitting, particularly if your vehicle's had any running changes across its production years.
Confirmed for selected various vehicles. Use the vehicle registration lookup tool if you're not certain, or browse Engine Cooling System for other options.